The Test Studio TFS Plugin check-in dialog should provide a 'Checkin comment' field. Have you tried using this field and run into issues? Or is the issue that you would prefer to use existing rules rather than this manual field? If this field is missing, please provide a screenshot. If you have used this field, and it does not behave as expected within TFS, please provide a fresh application log for this behavior. If your goal is to use existing check-in comment rules, please let us know how these are defined, and we will do our best to identify a workaround. Thanks for helping us advise you.
All the best,
the Telerik team